Electrode for battery, battery, and method of producing electrode for battery
Abstract
An electrode for a battery comprises a base material and a negative electrode active material layer. The negative electrode active material layer is placed on a surface of the base material. The negative electrode active material layer includes graphite and a binder. A first layer and a second layer are formed in the negative electrode active material layer. The first layer is formed between the base material and the second layer. Relationships of “1.2≤A≤4”, “1<m2/m1”, and “1<θ2/θ1” are satisfied. A represents an aspect ratio of the graphite. m1 represents a mass fraction of the binder in the first layer. m2 represents a mass fraction of the binder in the second layer. θ1 represents an orientation angle of the graphite in the first layer. θ2 represents an orientation angle of the graphite in the second layer.
Claims
exact text as granted — not AI-modifiedWhat is claimed is:
1 . An electrode for a battery, the electrode comprising:
a base material; and a negative electrode active material layer, wherein the negative electrode active material layer is placed on a surface of the base material, the negative electrode active material layer includes graphite and a binder, a first layer and a second layer are formed in the negative electrode active material layer, the first layer is formed between the base material and the second layer, and relationships of expressions (1) to (3) are satisfied:
1.2
≤
A
≤
4
(
1
)
1
<
m
2
/
m
1
(
2
)
1
<
θ2
/
θ1
(
3
)
where
A represents an aspect ratio of the graphite,
m1 represents a mass fraction of the binder in the first layer,
m2 represents a mass fraction of the binder in the second layer,
θ1 represents an orientation angle of the graphite in the first layer, and
θ2 represents an orientation angle of the graphite in the second layer.
2 . The electrode for a battery according to claim 1 , wherein a relationship of an expression (4) is further satisfied:
0.02
≤
I
110
/
I
0
0
2
(
4
)
where
I 110 represents a diffraction intensity of a (110) plane in an X-ray diffraction profile of the negative electrode active material layer, and
I 002 represents a diffraction intensity of a (002) plane in the X-ray diffraction profile of the negative electrode active material layer.
3 . The electrode for a battery according to claim 1 , wherein the negative electrode active material layer has a thickness from 100 to 400 μm.
4 . The electrode for a battery according to claim 1 , wherein a relationship of an expression (5) is further satisfied:
0.1
≤
T
1
/
(
T
1
+
T
2
)
≤
0
.
4
(
5
)
where
T1 represents a thickness of the first layer, and
T2 represents a thickness of the second layer.
5 . A battery comprising the electrode for a battery according to claim 1 .
6 . A method of producing an electrode for a battery, the method comprising, in the following order:
(a) forming a first layer by applying a first slurry to a surface of a base material; (b) forming a second layer by applying a second slurry to the first layer; (c) applying a magnetic field to the first layer and the second layer; and (d) drying the first layer and the second layer to form a negative electrode active material layer, wherein each of the first slurry and the second slurry includes graphite, a binder, and a dispersion medium, and relationships of expressions (6) and (7) are satisfied:
2
<
η1
/
η2
(
6
)
1
<
r
2
/
r
1
(
7
)
where
η1 represents a viscosity of the first slurry,
η2 represents a viscosity of the second slurry,
r1 represents a blending ratio of the binder in a solid matter of the first slurry, and
r2 represents a blending ratio of the binder in a solid matter of the second slurry.Join the waitlist — get patent alerts
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